Can Bitcoin scale to become a major payment network?
Of course it is possible, there is already an implemented scaling proposal which is segwit and lightning network is on its way but the real problem here is people don't see Bitcoin as it must be which is payment method, instead people are taking advantage of Bitcoin's volatility and use it as an investment. But what I think is if lightning network will be the solution to scaling problem of Bitcoin, at can be a good start for merchants or online shops to start accepting Bitcoin as payment method and also those who stop accepting it will resume it even even if it is highly volatile.